Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AB4YJ callsign genealogy
Currently held by COOK, JAMES S
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by AB4YJ's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AB4YJ.
No current licensee on record previously held this callsign.